Writing pen



FIG. 1 is a top, front, left perspective view of the writing pen according to a first embodiment of my design;

FIG. 2 is a bottom, left, front perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top view thereof; and

FIG. 8 is a bottom view thereof;

FIG. 9 is a top, front, left perspective view of a second embodiment of the writing pen according to my design;

FIG. 10 is a bottom, left, front perspective view thereof;

FIG. 11 is a front elevational view thereof;

FIG. 12 is a left side elevational view thereof;

FIG. 13 is a rear elevational view thereof;

FIG. 14 is a right side elevational view thereof;

FIG. 15 is a top view thereof; and,

FIG. 16 is a bottom view thereof. 

The ornamental design for writing pen, as shown and described. 